Help pages of available functions (for a quickstart, see section
Examples in the help pages below).

    <ul>
      <li>
	<a href="ObservabilityTest.hlp">ObservabilityTest</a> determine which system's 
	variable (resp. parameters) are observable (resp. identifiable).
      </li> 
      <li>
	<a
	href="ObservabilitySymmetries.hlp">ObservabilitySymmetries</a>
	uses previous results in order to compute (some) symmetries
	acting on considered system and leaving its inputs and outputs invariant.
      </li>
    </ul>